Bug #71152 [NEW]: mt_rand() returns the different values from original mt19937ar.c

From: kusano4a at gmail dot com Operating system: All PHP version: master-Git-2015-12-17 (Git) Package: *Math Functions Bug Type: Bug Bug description:mt_rand() returns the different values from original mt19937ar.c Description: ------------ mt_rand() returns the different values from original mt19937ar.c. Although mt_rand() is required to be generate random numbers, I am concerned about that this difference implies possibly deterioration of randomness quality. Test script: --------------- <?php mt_srand(12345678); for ($i=0; $i<10; $i++) echo mt_rand().PHP_EOL; Expected result: ---------------- 527860569 1711027313 1280820687 688176834 770499160 412773096 813703253 898651287 52508912 757323740 Actual result: -------------- 1614640687 1711027313 857485497 688176834 1386682158 412773096 813703253 898651287 2087374214 1382556330 -- Edit bug report at https://bugs.php.net/bug.php?id=71152&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=71152&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=71152&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=71152&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=71152&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=71152&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=71152&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=71152&r=needscript Try newer version: https://bugs.php.net/fix.php?id=71152&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=71152&r=support Expected behavior: https://bugs.php.net/fix.php?id=71152&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=71152&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=71152&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=71152&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71152&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=71152&r=dst IIS Stability: https://bugs.php.net/fix.php?id=71152&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=71152&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=71152&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=71152&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=71152&r=mysqlcfg